Permutation-padlock.



Patented May 29, I900 D. N. LEHMER. PEBMUTATION PADLOGK.

(Apphcahon filed. Jan 9 1899 I zizzzag iilcZz/mc (No Model.)

ZZZZ I UNITED STATES T PATE T OFFICE.

'DERRICK N. LEIIMER, OF CHICAGO, ILLINOIS.

PERM UTATlON-PADLOCK.

SPECIFICATION formingpart of Letters Patent N 0. 650,404, dated May 29, 1900. 4

Application filed January 9, 1899.

To all whom it may concern:

Be it known that I, DERRICK N. LEHMER, a citizen of the United States, residing in the city of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Permutation Locks; and I do hereby declare the following to be a full, clear, and exact description of the in-, vention, such as will enable persons who are skilled in the art to which it appertains to make and use the same.

My invention has reference to improvements in permutation-locks, and more especially to padlocks of this class.

The objects of my invention are to improve generally the construction of permutationpadlocks by simplifying and reducing the cost and number of parts usually required in this class of locks and by numbering and indexin g the dial so that the characters thereon will constitute a system of mnemonics for assisting the memory to retain the combination for which the lock may be set and to increase the permissible number of permutations usual in such locks.

With these and other objects in view my invention consists in the novel construction, combination, and relation of parts hereinafter more fully described, and particularly pointed out in the appended claims and illustrated in the accompanying drawings, which form a part hereof, in which-- Figure 1 is a perspective View of my completed lock. Fig. 2 is a side view with one of the side covers, dial, and tumbler-wheels removed, showing the lock closed. Fig. 3 is a similar view showing the lock open. Fig. 4 is is a side view of the case of the lock with everything removed exoept one tumbler-wheel. Fig. 5 is a vertical cross-section through line 5 of Fig. 2. Fig. 6 is a partially-perspective edge view of the look when closed.

Like letters of reference refer to similar parts in all of the views.

The containing-case is composed of the ring a and the two side covers I) 1). One of the covers may be made integral with the ring, as shown in Figs. 5 and 6. Both of the covers are perforated through their centers, in which studs b and b*, respectively, have bearings. The covers are preferably countersunk on the outside surface, into which dial- Serial No. 701,627. (No model.)

disks b and are placed, so that their outside surfaces come practically flush with the outside rim of the respective covers. The dials b and b are each'connected to atumbler- Wheel 0 and c by the studs 19 and 17 The studs are each rigidly attached to their respective dials; but they are attached to their respective tumbler-wheels by means of soft solder or the like. The'reason for this especial means of attachment will be hereinafter more fully explained. The bow d swings on the pivot d and has an extension d, which projects into the caseand moves between the two tumbler-wheels c and c. A spring 6 is attached to the case-rin g a, one end of which impinges against the extension at with sufficient pressure to open or throw back the bow d when released by the dogf. The other end of the spring e bears against the dog f, so as to hold it normally in the position shown in Fig. 2.

The spring-tumbler 9 (shown in Figs. 2 and 3) is attached to the inside of the case-ring and normally bears against its inner surface and presses the button It outward in position. (Shown in Figs. 1 and 2.) The tumbler g is bent practically at right angles at its upper end, and it is adapted to enter notch c of wheels 0 and a. Small notches c are out into the face-surface of the tumbler-wheels c and c.

The dial 6 is preferably numbered to correspond with the face of a clock. Fora convenient means for turning the dial I prefer to engine-turn or to cross-cut the center part of the dial, as shown at b, Fig. 1, so that when the pressure of the finger or thumb is applied against this portion of the dial there will be suflicient friction to turn the dial and the attached tumbler-wheel.

Taking a vertical line through the center of Fig. 5, the lock on one side of the line is an exact duplicate of that on the other side. Fig. 2 shows the lock closed; but the combination is in position to open it by the mere'pressure of the button h.

The operation of my lockis as follows: Suppose the lock combination is set to open at 12.30, you should remember that when looking at the look, as shown in Fig. 1, the dial at which you are looking represents the hour, and the dial 011 the obverse side, which is an finger, as explained. Then the notch (2 will come opposite the upper end of the tumbler g, as shown in Fig. 2. After this has been done set the V I of the dial-index on the opposite side to point I. This will complete the combination of 12 on the hour side and 30 on the minute side. Then the notches c of the tumbler-wheels will both be in position shown in Fig. 2, so that when the button h is pressed inward the tumbler Q will enter the notches o of tumbler-wheels c and c. The end of the tumbler 9 will then press against the dog f, displacing it against the resistance of spring e, liberating the how 01, and unlockingthe lock. The other end of springecauses the bow d to fly open, as shown in Fig. To close the look, all that is necessary is to depress the bow (1 until the notch thereon passes the'notch on the dog f, when the spring e will force the dog finto the notch on the bow d and hold it locked. Now if the tumbier-wheels are moved so that the deep notches c thereon are not in a coincident position, as shown in Fig. 3, then the button h cannot be sufficiently depressed to displace the dog f, because it will be arrested by the tumblerwheels cc, as will be plainly evident.

The object of the small notches c is to prevent the deep notches from being found by gently depressing the button and turning the dials, which might be easily accomplished if the surfaces of the tumbler wheels were smooth instead of being notched, as shown.

To change the combination all that is necessary-to dois to place the tumbler-wheels in positions shown in Fig. 3, depress the button h, soas to hold them in position, and turn the lockon its side, with the dial to be changed face up. It will be noticed that the studs 12 and 19 extend from their respective dials into counterbored holes made in the tumbler-wheels. These counterbored holes are filled with soft solder for securing the studs to the wheels. Then hold a hot soldering-iron on the center of the dial until the solder uniting the dial and stud b or b has melted. Then turn the dial to the desired new positionand allow the solder to cool and reunite the dial and respective tumbler-wheel together by means of the stud. In this way both or either dial may be changed as often as desired. When the lock is turned in the horizontal position described, the solder will be retained in the counterbored cups formed in the tumbler-wheels when melting and will not adhere to the covers.

I have found from experience that it is much easier to remember a combination when the figures correspond to some hour of the day than it is to remember arbitrary numbers.

I desire it understood that I do not limit myself to the specific details of construction herein shown and described, but reserve to myself the right to make such changes in the form and arrangement of the various parts of the apparatus as fairly fall within the spirit and scope of my invention.

Having thus fully described. my invention, what I claim as new and useful, and desire to secure by Letters Patent, is--- 1. In a permutation-lock the combination of a dial, or indicator, mounted on the outside case thereof; a tumbler-wheel within the said case, a stud for connecting the said dial and tumbler-wheel together and a soldered joint between the said stud and tumbler-wheel, substantially as shown and described.

2. In a permutation-lock the combination of a containing-case; a dial on each side of the case having a. clock-face index, said dials being connected to tumbler-wheels within the containing-case; a dog pivoted to operate between the said tumbler-wheels adapted to normally engage with the bolt or how of the said look; a tumbler for displacing the said dog, and a push-button for depressing the said tumbler, substantially as shown and described.

In testimony whereof I have signed this specification, in the presence of two subscribing witnesses, this 5th day of January, 1899.

DERRICK N. LEIIMER.

Witnesses:

Foniin BAIN, M. F. ALLEN. 

